Autore:Hermann Günther Grassmann
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- ↑ 1,0 1,1 Gemeinsame Normdatei
- ↑ 2,0 2,1 data.bnf.fr
- ↑ 3,0 3,1 MacTutor
- ↑ 4,0 4,1 Brockhaus Enzyklopädie
- ↑ 5,0 5,1 Gran Enciclopèdia Catalana
Grassmann XIX secolo matematico tedesco